This is what 100 marks looked like in 1976.

The Deutsche Mark (“German mark”), [ … ] was the official currency of West Germany from 1948 until 1990 and later the unified Germany from 1990 until the adoption of the euro in 2002. [ … ]

“Deutsche Mark.” Wikipedia, Wikimedia Foundation, 26 December 2021, https://en.wikipedia.org/wiki/Deutsche_Mark.